Tension device.



PATENTED FEB. 28, 1905.

H E. LAWSON. TENSION DEVICE.

APPLICATION FILED NOV.19, 1904.

2 SHEETS-SHEBT 1.

PATENTED FEB. 28, 1905.

E. LAWSON. TENSION DEVICE.

APPLIGATION FILED 110v. 19, 1904.

2 SHEETS-SHEET 2.

lm'vi nomao g. L

nrr Sines Patented February 28, 1905.

TENSION DEVIQIE SPECIFICATION forming part of Letters Patent No. 783,871, dated February 28, 1905.

Application filed November 19, 1904. Serial No. 233,547.

To rtZZ whom if; nuty concern:

Be it known that I, EDWARD LAWSON, a citizen of the United States, residingin Eldorado, (Rural Free Delivery No. 1,) in the county of Fond du Lac, State of Wisconsin, have invented certain new and useful Improvements in Tension Devices; and I do hereby'declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to tension devices, and more particularly to those especially adapted-for use on harvesters, and has for its object to provide a tension device which will permit of the free passage of the twine therethrough, which will be so arranged that it may be quickly and easily adjusted, and which may be attached either to the binder-table or to the twine-box.

A further object is to provide a tension which will permit of the passage of knots therethrough and which will also permit the cord to turn therein to remove the torsional strain from the cord caused by the unwinding of the latter from the ball.

Other objects and advantages will be apparent from the following description, and it will be understood that modifications of the specific construction shown may be made and any suitable materials may be used without departing from the spirit of the invention.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in the several views, Figure l is a side elevation of the device attached to the binder-table. Fig. 2 is a view similar to Fig. 1, showing the device attached to the twine-box. Fig. 3 is a top plan view of Fig. 1. Fig. 4- is a central longitudinal section of the device with the cord removed.

Referring now to the drawings, the present invention comprises a base-plate 5, having upwardly-extending transversely-spaced arms 6 at its forward end and having an upright 7 at its rearward end. Journaled between the arms 6 there is a peripheral]y-grooved wheel 8, and hinged at its rearward end to the upper end of the upright 7 there is a tension-arm 9, having a convolution 10 adjacent to its forward end, which is engaged over the wheel 8. A rod 11 is secured at its lower end to the base-plate 5 between the wheel 8 and the upright 7, this rod extending upwardly through a perforation 12 in the tension-arm 9. A helical spring 13 is engaged with the rod 11 above the tension-arm, and it is disposed with its lower end resting upon the latter, its upper end bearing against a head 14:, which is adjustably mounted upon the upper end of the rod and by means of which the tension of the spring may be varied. Formed through the base-plate 5 just rearwardly of the wheel 8 there is a passage 15, a similar passage 16 being formed through the upright 7.

\Vhen the device is attached to the bindertable, as shown in Fig. l, the cord as it comes from the cord-box is passed first through the opening 16 and then over the wheel 8 between this wheel and the convolution 10 of the tension-arm 9, the sgring 1.3 hoiding the ten sion-arm against the cord, as it will be readily understood. When the device is attached to the cord-box, as shown in Fig. 2, the cord is passed first through the passage 15 and then over the wheel 8. Openings 17 are "formed through the base-plate 5 for the reception of screws by which the device may be screwed in position.

\Vhat is claimed is 1. A tension for binders comprising a basemounted upon the hasemlate, an upright rarried by the base-plate and having a passage therein, a tension-arm pivotally connected with the uprightaml having a curve in which the wheel is engaged, and means for holding the tension-arm yieldabl y in engagement with the periphery of the wheel, said base-plate having a passage formed therethrongh adjacent to the wheel.

2. A tension device comprising a base-plate, spaced arms mounted upon the forward end of the base-plate, a wheel revolubly mounted between said arms, said base-plate having a passage therethrough ust rearwardly of the 1 wheel, an upright carried by the rearward plate, a peripherally-grooved wheel revoluhly" end of the base-plate, and having a passage and arranged for movement to vary the ten- 10 therethrongh, a tension-arm pivoted to the sion of the spring. upright at its rearward end and lying with y In testimony \vhereofIaffiX my signature in its forward portion in engagement with the i presence of tWo Witnesses.

Wheel, a rod secured to the base-plate and T siidably engaged in the tension-arm, a spring EDVARD LAWSON engaged with the rod above the tension-arm \Vitnesses: and resting thereagainst, and a head ad ust WV. R. LYLE, ably mounted upon the rod above the spring, J. E. CARTER. 

